{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-76166 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2026-76166 yet. Limit exposure of the affected software until one is available.","what":"CVE-2026-76166 is a medium-severity vulnerability in Red Hat JBoss Enterprise Application Platform 7, published on 19 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-76166 and fix it if it is affected.\n\nWhat it is: CVE-2026-76166 is a medium-severity vulnerability in Red Hat JBoss Enterprise Application Platform 7, published on 19 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-76166 in the wild and no public exploit code.\n\nAffected product: Red Hat JBoss Enterprise Application Platform 7. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-76166/ (Markdown: https://insights.sbomify.com/CVE-2026-76166/index.md)","id":"CVE-2026-76166","markdown":"https://insights.sbomify.com/CVE-2026-76166/index.md","name":"CVE-2026-76166","record":{"aliases":["GHSA-p4rg-ffff-6pmm"],"analysis":{"component_type":"server_software","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"JBoss mod_cluster","requires_auth":"none","summary":"An unauthenticated attacker can cause a permanent denial of service in the mod_cluster advertise listener by sending a crafted UDP multicast datagram.","user_interaction":"not_required","vuln_class":"null_dereference"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"redhat","cpe":[],"cvss":{"score":4.3,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","version":"3.1"},"cwes":[{"id":"CWE-476","name":"NULL Pointer Dereference"}],"description":"A flaw was found in mod_cluster's AdvertiseListenerImpl (org.jboss.modcluster core module). A single crafted UDP multicast datagram with a valid HTTP status line and a \"Server:\" header but without the \"Date:\", \"Digest:\", and \"Sequence:\" headers triggers a NullPointerException in verifyDigest() that is not caught by the worker thread's exception handler. This causes the advertise listener thread to terminate permanently. The failure is silent (isListening() continues to return true) and persists until the node is restarted. The crash occurs before the AdvertiseSecurityKey comparison, so deployments with a configured security key are still affected.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":null,"headline":"Modcluster-core: mod_cluster advertise listener: unauthenticated dos via crafted multicast datagram","id":"CVE-2026-76166","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"null_dereference","year":"2026"},"n_packages":0,"n_references":2,"next":{"headline":"fastify vulnerable to authentication bypass via malformed URLs reaching encapsulated not-found handlers","id":"CVE-2026-76169"},"packages":[],"prev":{"headline":"Authenticated Server-Side Request Forgery in AIL Framework Crawler Allows Access to Internal Network Resources","id":"CVE-2026-76164"},"products":["Red Hat JBoss Enterprise Application Platform 7","Red Hat JBoss Enterprise Application Platform 8","Red Hat JBoss Enterprise Application Platform Expansion Pack","Red Hat JBoss Web Server 5","Red Hat JBoss Web Server 6","Red Hat JBoss Web Server 7","Red Hat Single Sign-On 7"],"published":"2026-08-19","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-08-20","vendors":["Red Hat"]},"summary":"An unauthenticated attacker can cause a permanent denial of service in the mod_cluster advertise listener by sending a crafted UDP multicast datagram.","url":"https://insights.sbomify.com/CVE-2026-76166/"}